A-1000/A-1020 info/repair thread

That is a great help, thanks James. I had a service shop diagnose the amp and they said three of the transistors were bad and the estimated it would be $250 to replace them all. So, I'm considering doing it myself!

I agree with James both with his parts recs and in saying it will likely need some additional parts replaced.

Look around the bad channel for any of those standing up green resistors and see if the have a brown or burned band around them. They are fusable and will open up. Sometimes the damage is hard to spot and looks very much like a color band so a magnifier may be of help.
Those you can replace with flame proof carbon or metal films.

Also check the other channel for loose or cracked solder joints. My driver transistors were completely loose in their board along with many other cracked joints. Again, magnifier is helpful here.